Hello All, The event did cause some problems to our roads. The worst section is on Flume Road before weir 5. I would not recommend travel with low clearance vehicles. The other bad section is Near weir 9 on the north facing slope road. The main Hubbard Brook Road had no damage. Ian

Ian Halm, Forester  Site Manager Forest Service Hubbard Brook Experimental Forest p: 603-726-8902 x20  c: 603-397-7966  ihalm@fs.fed.us 234 Mirror Lake rd North Woodstock, NH 03262 www.fs.fed.us Caring for the land and serving people

From: HubbardBrookCOS [mailto:hubbardbrookcos-bounces@lists.sr.unh.edu] On Behalf Of Bailey, Scott -FS
Sent: Sunday, July 02, 2017 11:02 AM
To: hubbardbrookcos@lists.sr.unh.edu
Subject: [HubbardBrookCOS] Heads up and Caution: Major runoff event at Hubbard Brook

Dear COS:

I want to alert you to a major runoff event that happened at Hubbard Brook yesterday. The most important message is to be careful in the woods and drive carefully. There is some damage to the road between weir 1 and 4, and to shoulders, which may not be safe to park on in some places. There may be major erosion around some streams and trails. Anyone who has crews working onsite now, please pass on a safety message to your crews.

Preliminary data show a peak stage of 2.26 ft at weir 3, which would place this as the 8^th highest flow ever measured (moving Irene to 10^th place). Weir 9 appears to have peaked at 3.6 ft, which is likely a record there. The last streamflow event that was larger than this was in January 2006. The last big event this time of year was on June 29, 1973, when weir 3 peaked at 1.97 ft (28^th largest).

Beyond the safety concern, there may be implications and opportunities for science, particularly for those working on streams. I have never seen suspended sediments so high and large trees were transported downstream along the main stem of Hubbard Brook. This was a major channel scouring event and there may have been quite a bit of channel erosion or re-routing in some areas. Any reports along these lines would be appreciated.

Stay safe!

- Scott

Scott W. Bailey, PhD Research Geologist Forest Service Northern Research Station p: 603-726-8902 x11 f: 603-726-4851 swbailey@fs.fed.us 234 Mirror Lake Road North Woodstock, NH 03262 www.fs.fed.us Caring for the land and serving people

This electronic message contains information generated by the USDA solely for the intended recipients. Any unauthorized interception of this message or the use or disclosure of the information it contains may violate the law and subject the violator to civil or criminal penalties. If you believe you have received this message in error, please notify the sender and delete the email immediately.